CVE-2026-46320: tap: free page on error paths in tap_get_user_xdp()
Published Jun 9, 2026
·Updated
In the Linux kernel, the following vulnerability has been resolved:
tap: free page on error paths in tapgetuserxdp()
tapgetuserxdp() rejects a frame shorter than ETHHLEN with -EINVAL, and returns -ENOMEM when buildskb() fails. Both paths jump to the err label without freeing the page that vhostnetbuildxdp() allocated for the frame. tapsendmsg() discards the per-buffer return value and always returns 0, so vhosttxbatch() takes the success path and never frees the page; each rejected frame in a batch leaks one page-frag chunk.
Free the page on both error paths, before the skb is built. This is the tap counterpart of the same leak in tunxdpone().
Affected Software
249 affected componentsFixes available
Linux Linux kernel
Microsoft azl3 kernel 6.6.141.1-1<6.6.143.1-1
6.6.143.1-1
Linux Linux kernel>=4.20<5.10.259
Linux Linux kernel>=5.11<5.15.210
Linux Linux kernel>=5.16<6.1.176
Linux Linux kernel>=6.2<6.6.143
Linux Linux kernel>=6.7<6.12.94
Linux Linux kernel>=6.13<6.18.36
Linux Linux kernel>=6.19<7.0.12
Linux Linux kernel=7.1-rc1
Linux Linux kernel=7.1-rc2
Linux Linux kernel=7.1-rc3
Linux Linux kernel=7.1-rc4
Linux Linux kernel=7.1-rc5
ubuntu/linux-hwe-edge*
ubuntu/linux-aws-5.0*
ubuntu/linux-aws-5.3*
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ubuntu/linux-azure-edge*
ubuntu/linux-gcp*
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ubuntu/linux-raspi*
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debian/linux
6.1.176-16.1.190-16.12.107-16.12.115-27.2.12-17.2.15-1
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.6.143.1-1 - Compensating control
In tap_get_user_xdp(), free the page allocated by vhost_net_build_xdp() on both error paths before building the skb, including when the frame is shorter than ETH_HLEN and when build_skb() returns -ENOMEM.
Event History
Jun 9, 2026
CVE Published
via MITRE·12:11 PM
Data Sourced
via MITRE·12:11 PM
DescriptionSeverity
Data Sourced
via OSV·01:16 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·01:16 PM
RemedyDescriptionSeverityWeaknessAffected Software
Jun 10, 2026
Data Sourced
via Microsoft·08:06 AM
DescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2026-46320?
CVE-2026-46320 has a severity rating of 7.4, categorized as high.
2
How do I fix CVE-2026-46320?
To fix CVE-2026-46320, update your Linux kernel to the latest version that includes the patch for this vulnerability.
3
What systems are affected by CVE-2026-46320?
CVE-2026-46320 affects Linux kernel versions prior to the fix implemented in subsequent releases.
4
What type of vulnerability is CVE-2026-46320?
CVE-2026-46320 is a memory management vulnerability due to improper handling of error paths in the tap_get_user_xdp function.
5
What are the potential impacts of CVE-2026-46320?
The potential impact of CVE-2026-46320 includes denial of service, as the vulnerability could allow for resource exhaustion from not freeing allocated memory.